PREPARE FOR MENTAL ILLNESS!
276 kids, 6 - 12 kids a pregnancy,
276 / 6 = 46
276 / 12 = 23
Averaging that, that's about 35 times by that logic.
If you only ever fucked your wife 35 times having been married to her for over at least five years I wouldn't call that great sex.
I'd say that logic is just flawed and you shouldn't apply it to an older-than-all-of-us joke.